You must have been staying at a Holiday Inn while watching Nova.
Note that in your own reply, you used the term "theory." A theory is an idea to be tested and proved. A theory is not a fact. There used to be a bunch of scientists that had theories about a flat planet and a sun that rotated around the earth. Eventually these theories were proved wrong.
Don't believe anything you hear, and only half of what you see.
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Note that in your own reply, you used the term "theory." A theory is an idea to be tested and proved. A theory is not a fact.
Yes -- a theory in science is a testable hypothesis that explains observations. Sometimes "theory" is applied to things that are completely accepted as fact, such as the "theory of relativity" (this particular theory made a number of predictions which have all been abundantly verified). Sometimes "theory" is applied to things generally accepted as true but perhaps still controversial (the theory of evolution might be an example of this), and sometimes to things which are as yet completely unproved. In the case of our dear departed mammoths, there are competing theories that offer good explanations for their extinction but no convincing test available for eliminating the one theory or the other. I think, however, it is clear that humans were capable of causing the extinction (whether or not they were guilty).